Answer:
In the US, it's typically harvested with a machine called a combine, which pulls the mature ears off the plant, threshes them to get the kernels off the cob, and then transfers the shelled corn to a waiting truck or other conveyance to the storage location. Some farmers still use a cornpicker, which skips the threshing step, and transfers the whole ears to the cart or truck for the trip to the storage unit.